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A PROCESS FOR DIRECT PRINTING

Publishing Venue

Xerox Disclosure Journal

Abstract

In planographic and letterpress direct printing, the imaged plate or master is inked by the use of a form roller and the inked image transferred directly to a receiver sheet. Offset printing is much more important as a commercial process, and one of the principal reasons for this is that it is difficult to produce high quality prints by direct printing.

Country

Undisclosed

Language

English (United States)

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In planographic and letterpress direct printing, the imagedplate or master is inked by the use of a form roller and theinked image transferred directly to a receiver sheet. Offsetprinting is much more important as a commercial process, andone of the principal reasons for this is that it is difficultto produce high quality prints by direct printing.

It has recently been discovered that the need for a fountainsolution on a printing press can be obviated if the master iscoated in the non-imaged areas with a silicone elastomer whichis abhesive or ink releasing, A difficulty encountered withthese and other abhesive master materials when used in directprinting is that paper jams tend to occur because an electro-static charge tends to build-up in the normally insulatingabhesive polymers causing paper receiver sheets to be retainedon the master or impression cylinder.

It has now been discovered that this problem of paper jammingin which paper receiver sheets are retained on the master orimpression cylinder can be obviated by forming the non-imagedportions of the master of an abhesive normally insulatingpolymer with an amount of a quaternary ammonium salt suffi-cient to inhibit an electrostatic charge build-up on themaster and receiver sheet so as to prevent the receiver sheetfrom being retained on the master or impression cylinder, Theamount...